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Segmentation maps of other methods. (A) Hierarchical clustering (euclidean distance, complete linkage) after PCA-reduction of spectra to 70% explained variance. (B–C) With prior-to-clustering edge-preserving image denoising; k=10, moderate denoising. (B) High-dimensional discriminant clustering, reproduced from (Alexandrov et al., 2010) with permission from the American Chemical Society. (C) k-means.
